def _validate_device(self, device=None):
     bdms = db.block_device_mapping_get_all_by_instance(
         self.context, self.instance['uuid'])
     return compute_utils.get_device_name_for_instance(self.context,
                                                       self.instance,
                                                       bdms,
                                                       device)

 def _validate_device(self, device=None):
     bdms = block_device_obj.BlockDeviceMappingList.get_by_instance_uuid(
             self.context, self.instance['uuid'])
     return compute_utils.get_device_name_for_instance(
             self.context, self.instance, bdms, device)

 def _validate_device(self, device=None):
     bdms = base.obj_make_list(self.context,
         objects.BlockDeviceMappingList(), objects.BlockDeviceMapping,
         self.data)
     return compute_utils.get_device_name_for_instance(
         self.instance, bdms, device)

 def _validate_device(self, device=None):
     return compute_utils.get_device_name_for_instance(self.context,
                                                       self.instance,
                                                       device)